Re: "kernel: rtfree: 0xc3c4bd98 has 2 refs" on recent current

Fri, 15 Jun 2007 09:06:41 -0700 

Here is a backtrace:

rtfree: 0xc3c5cca8 has 2 refs
KDB: stack backtrace:
db_trace_self_wrapper(c06b84de,e111dad4,c05d18f1,c06be1ff,c069bdd1,...)

at db_trace_self_wrapper+0x26

kdb_backtrace(c06be1ff,c069bdd1,c3c5cca8,2,c3c5cca8,...) at kdb_backtrace+0x29
rtfree(c3c5cca8,c3b3a010,10,c05d190b,c3c5cd98,...) at rtfree+0x51
rtredirect(e111dba0,e111db90,0,6,e111db80,...) at rtredirect+0x1cf
icmp_input(c3d14400,14,e111dbd8,0,c3c63e00,...) at icmp_input+0x50f
ip_input(c3d14400,c05bd255,800,c39e5800,800,...) at ip_input+0x6ae
netisr_dispatch(2,c3d14400,10,3,0,...) at
netisr_dispatch+0x55
ether_demux(c39e5800,c3d14400,3,0,3,...) at ether_demux+0x1aa
ether_input(c39e5800,c3d14400,2,1,c396cc84,...) at ether_input+0x323
bfe_intr(c39d1000,0,c06b4383,46b,0,...) at bfe_intr+0x41a
ithread_loop(c39eb730,e111dd38,0,0,0,...) at ithread_loop+0x1ab
fork_exit(c0511d70,c39eb730,e111dd38) at fork_exit+0x99
fork_trampoline() at fork_trampoline+0x8
--- trap 0, eip = 0, esp = 0xe111dd70, ebp = 0 ---


Here is an incoming ICMP packet (the last one) causing the "rtfree has
2 refs" message (00:19:b9:5a:a3:10 is my host):

17:47:46.915491 00:0c:29:b2:14:38 > 00:19:b9:5a:a3:10, ethertype IPv4 (0x0800), 
length 70: (tos 0x0, ttl  64, id 48899, offset 0, flags [none], proto: ICMP (1), 
length: 56) 192.168.0.25 > 192.168.0.55: ICMP redirect 192.168.0.1 to host 
192.168.0.1, length 36
        (tos 0x0, ttl  16, id 0, offset 0, flags [none], proto: UDP (17), length: 
328) 192.168.0.55.68 > 192.168.0.1.67:  [|bootp]
        0x0000:  4500 0038 bf03 0000 4001 3a21 c0a8 0019  [EMAIL 
PROTECTED]:!....
        0x0010:  c0a8 0037 0501 48f7 c0a8 0001 4500 0148  ...7..H.....E..H
        0x0020:  0000 0000 1011 281d c0a8 0037 c0a8 0001  ......(....7....
        0x0030:  0044 0043 0134 efa2                      .D.C.4..
17:47:46.942512 00:19:b9:5a:a3:10 > 00:50:bf:b1:34:a3, ethertype IPv4 (0x0800), 
length 70: (tos 0x0, ttl  64, id 207, offset 0, flags [none], proto: ICMP (1), 
length: 56) 192.168.0.55 > 192.168.0.1: ICMP 192.168.0.55 udp port 68 unreachable, 
length 36
        (tos 0x0, ttl  64, id 14203, offset 0, flags [none], proto: UDP (17), 
length: 334) 192.168.0.1.67 > 192.168.0.55.68:  [|bootp]
        0x0000:  4500 0038 00cf 0000 4001 f86d c0a8 0037  [EMAIL PROTECTED]
        0x0010:  c0a8 0001 0303 0dbe 0000 0000 4500 014e  ............E..N
        0x0020:  377b 0000 4011 c09b c0a8 0001 c0a8 0037  [EMAIL PROTECTED]
        0x0030:  0043 0044 013a ed7d                      .C.D.:.}
17:47:46.942528 00:19:b9:5a:a3:10 > 00:50:bf:b1:34:a3, ethertype IPv4 (0x0800), 
length 70: (tos 0x0, ttl  64, id 208, offset 0, flags [none], proto: ICMP (1), 
length: 56) 192.168.0.55 > 192.168.0.1: ICMP 192.168.0.55 udp port 68 unreachable, 
length 36
        (tos 0x0, ttl  64, id 14204, offset 0, flags [none], proto: UDP (17), 
length: 334) 192.168.0.1.67 > 192.168.0.55.68:  [|bootp]
        0x0000:  4500 0038 00d0 0000 4001 f86c c0a8 0037  [EMAIL PROTECTED]
        0x0010:  c0a8 0001 0303 0dbe 0000 0000 4500 014e  ............E..N
        0x0020:  377c 0000 4011 c09a c0a8 0001 c0a8 0037  7|[EMAIL PROTECTED]
        0x0030:  0043 0044 013a ed7d                      .C.D.:.}



The behavior was introduced by following commit:

glebius     2007-05-22 16:17:32 UTC

FreeBSD src repository

Modified files:
  sys/net              route.c
Log:
Some minor cleanups:
- In rt_check() remove the senderr() macro and the "bad" label. They
  used to simplify code, but now aren't.
- Remove extra RT_LOCK_ASSERT() in rt_setgate(). The RT_REMREF macro
  does this.
- In rtfree() convert panics to KASSERTs.
- Strict the routing API: rtfree() should be called only in a case
  when we are completely sure we've got the last reference on the
  rtentry. In all other cases RTFREE_LOCKED() macro should be used.
  If the reference isn't the last one spit out a warning printf.
  Correct the only(?) case for this in rt_check().
- Fix typos in comments.

Revision  Changes    Path
1.119     +15 -22    src/sys/net/route.c

--
/tut
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